Today's 12/21/12, the date of the Mayan Apocalypse. In this game, you will use some evil device to destroy the world. The next player will counter your device, then use their own, etc. Example Bob: I end the world by throwing a meteor of flaming zombie snakes at earth.
Joe: I catch it in a huge slingshot, and throw it away from earth I end the world by eating all the bacon. And so on. So, I shall start. I end the world by flooding the earth with crappy, fast food ketchup.